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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical Characteristics of Layered-Spinel 0.7Li2MnO3·0.3Li4Mn5O12 Composite Powders with Spherical Shape and Porous Nanostructure
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Electrochemical Characteristics of Layered-Spinel 0.7Li2MnO3·0.3Li4Mn5O12 Composite Powders with Spherical Shape and Porous Nanostructure

机译：尖晶石型0.7Li 2 MnO 3 ·0.3Li 4 Mn 5 O 12的电化学特性球形和多孔纳米结构的复合粉末

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摘要

Layered-spinel 0.7Li2MnO3.3Li4Mn5O12 composite cathode powders are prepared by spraypyrolysis. Composite powders post-treated at temperatures below 800C have spherical shapes and2porous nanostructures. The BET surface areas of the composite powders decrease from 18.8 to 1.8 m g when the post-treatment temperature is increased from 550C to 850C. The composite powders3+/4+ post-treated at temperatures below 700C have similar charge capacities due to the Mn redox reaction of the spinel component when they are initially charged to 4.5 V (about 41 mAh g ).However, the initial charge capacities of the composite powders post-treated at 550C, 600C, 650C, and 700C are 203, 197, 166, and 105 mAh g , respectively, when they are charged to 4.95 V. Theelimination of Li2O from the layered Li2MnO3 component is affected by the crystallite size of theLi2MnO3 phase as well as the grain size in the composite powders. The discharge capacities of the composite powders post-treated at 600C increase from 220 to 263 mAh g after 3 cycles. Then, the discharge capacities monotonically decrease to 201 mAh g after 30 cycles.
机译：采用喷雾热解法制备了层状尖晶石0.7Li2MnO3.3Li4Mn5O12复合正极粉。在低于800℃的温度下进行后处理的复合粉末具有球形和2孔的纳米结构。当后处理温度从550℃增加到850℃时，复合粉末的BET表面积从18.8降低到1.8m g。在700摄氏度以下的温度下进行后处理的复合粉末3 + / 4 +由于最初被充电至4.5 V（约41 mAh g）时的尖晶石成分的Mn氧化还原反应而具有相似的充电容量。在550C，600C，650C和700C下进行后处理的复合粉末在充电至4.95 V时分别为203、197、166和105 mAh g。从层状Li2MnO3组分中去除Li2O受微晶尺寸的影响Li 2 MnO 3相的含量以及复合粉末的粒度。在3个循环后，在600℃下后处理的复合粉末的放电容量从220增加到263mAh g。然后，在30个循环后，放电容量单调降低至201mAh g。

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